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    • 4. 发明授权
    • Apparatus for and method of detecting a coded magnetic thread
    • 用于检测编码磁线的装置和方法
    • US07516893B2
    • 2009-04-14
    • US11410131
    • 2006-04-25
    • John ButtifantJohn Alan SkinnerPeter Dilwyn EvansMichael PotterPeter Alan PullanBarry Clifford Scowen
    • John ButtifantJohn Alan SkinnerPeter Dilwyn EvansMichael PotterPeter Alan PullanBarry Clifford Scowen
    • G06K7/08
    • G06K7/084G07D7/04
    • A method of detecting a coded magnetic thread is provided that includes sensing the response of a magnetic field detector as a thread passes the detector, the response varying from an initial magnitude in first and second senses to exhibit a first peak, and then in the first sense to exhibit a second peak; comparing the response with first and second thresholds disposed about the initial magnitude in the first and second senses respectively; and indicating the passage of a code element of the thread when the response passes the second threshold and then the first threshold in a predetermined manner characterized in that the first threshold is adjusted in accordance with a first predetermined algorithm based on the magnitude of the first peak. The first predetermined algorithm adjusts the first threshold so that the magnitude of the first threshold is the average of a predetermined number of preceding first peaks.
    • 提供了一种检测编码磁线的方法,其包括当线程通过检测器时感测磁场检测器的响应,响应从第一和第二感测中的初始幅度变化以展现出第一峰值,然后在第一 意义上表现出第二个高峰; 将响应与分别围绕第一和第二感测的初始幅度设置的第一和第二阈值进行比较; 并且当所述响应经过所述第二阈值然后以预定方式通过所述第一阈值时,指示所述线程的代码元素的通过,其特征在于,基于所述第一峰值的大小,根据第一预定算法来调整所述第一阈值 。 第一预定算法调整第一阈值,使得第一阈值的幅度是预定数量的先前第一峰值的平均值。